Hi. Can you please check the plugin System tab -> Octane Log, which should hopefully list the error you are getting.
Paul
Win7/Win10/Mavericks/Mint 17 - GTX550Ti/GT640M Octane Plugin Support : Poser, ArchiCAD, Revit, Inventor, AutoCAD, Rhino, Modo, Nuke, DAZ Studio Pls read before submitting a support question